I am interested too since we plan to use the units as permanent monitoring stations.
Would this be compatible?
http://uk.farnell.com/lemo/fgg-0t-309-clac50z/circular-connector-plug-9pos-cable/dp/2442859?ost=LEMO++FGG.0T.309.CLAC50Z&selectedCategoryId=&categoryNameResp=All&searchView=table&iscrfnonsku=false
On the Farnell website they are sold at 40€ each. Someone have found a cheaper, yet compatible, solution?